Key Takeaways
- Scenario 303 is mailbag / sack dual-SIM — not motorcycle hops, grain dumps, livestock rest, oversize escorts, RO-RO ferry ramps, returns inbound, air-cargo ULD, rail-ramp, hazmat placards, cross-dock transload, bonded customs, empty-container pickup, reefer dwell, milk-run consolidation, parcel lockers, or yard hold.
- “Sack MB-5 ready — cage 3, 05:40” is transactional. “Book our extra sack week” is marketing. Split SIMs.
- Dashboard OTP stays on a dedicated Android. A holiday pile will starve it.
- Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Free is 1 / 300 / 300. Developer is 25,000 SMS per year.
- Idempotent on sack + clock hour. Radio retries still spend operator credit.
- REST send fields live in Developer Center — not a CodeCanyon mailbag plugin. MCP, if you use it, is only a REST wrapper.
Summary
Scenario 303 is logistics dual-SIM for mailbag sacks. Dispatch owns the sack. SIM A texts the clerk a cage and a clock. Priced by devices and SMS send volume. You use your own phone and operator SMS credit.
If the sack number changes mid-sort, the clerk treats the next cage ping as spam — and you lose the only clock that matches the dispatch.
Mailbag hop
Keep SIM A on the live sack radio. Dual-SIM routing · logistics guide. Fields: Developer Center. Industry notes: GSMA.
SIM map
| Lane | Payload | SIM | Do not |
|---|---|---|---|
| Clerk / sack | MB id, cage, clock | SIM A (stable From) | Rotate MSISDN mid-sort |
| Sack promo | Extra week upsell | SIM B / promo | Ride the sack inbox |
| TOS login | OTP | Dedicated OTP phone | Share SIM A |
Same From on the sack
Keep the sack number stable so clerks recognize the cage ping. Idempotent send. DLR ≠ dispatched — DLR.
Cost
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Free: 1 device, 300 SMS lifetime, 300 contacts. Developer: 25,000 SMS per year. Paid plans uncap platform volume; devices still meter. Pricing.
Ops
Spare radio before a holiday pile. Doze · setup.
Security
Do not SMS the full sack board. Trust Center · OTP. Promo STOP off the sack inbox. STOP.
Checklist
- SIM A vs B labeled.
- Idempotency on sack + hour.
- OTP isolated.
- No full sack list on SMS.
- Airtime for holiday pile.
Next steps
Transactional SMS · SMS API documentation.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- multi-device and dual SIM routingCapacity and failover
- transactional SMS for orders and alertsEvent-driven messages
- SMS delivery reports (DLR)Delivery status tracking
- SMS API documentationLive endpoint reference
